12. Connect port 2 of drive channel 2 on the DS4700 Express to port 1B (
1
) on
the right ESM in the sixth EXP810 (
7
).
One DS4700 Express and two or more storage expansion
enclosures in a mixed configuration
When you cable the DS4700 Express Storage Subsystem to storage expansion
enclosures that are in a mixed configuration, it is recommended that you cable the
same type of enclosures together. If it is not possible to cable each group of
enclosures by model type (EXP100s, EXP710s, and EXP810s) in a separate
redundant drive loop pair or behind each port of the dual-ported redundant drive
channel pair, group them so that EXP810s are between EXP100s and EXP710s.
In addition, when an EXP100 is the first storage expansion enclosure cabled
directly to the storage subsystem's controller drive port, follow these rules:
v
Cable from the storage subsystem controller drive port to the OUT port on the
left ESM (ESM A) of the EXP100.
Note:
This is a change from previous cabling recommendations where you
cabled from the controller drive port to the IN port on the left ESM (ESM
A) of the EXP100.
v
If an EXP100 follows the initial EXP100, cable from the IN port on the left ESM
(ESM A) of the first EXP100 to the OUT port on the left ESM of the next
EXP100. Continue this cabling pattern until you encounter an EXP710 or
EXP810, then cable from the IN port on the left ESM (ESM A) of the EXP100 to
the IN port of the EXP710 or EXP810.
v
If an EXP710 or EXP810 follows the initial EXP100, cable from the IN port on the
left ESM (ESM A) of the EXP100 to the IN port of the EXP710 or EXP810. To
cable to the next storage expansion enclosure in the chain, cable from the OUT
port of the left ESM of the EXP710 or EXP810 to the IN port of the next storage
expansion enclosure.
v
Continue the left ESM (ESM A) cabling pattern by cabling from the OUT port to
the IN port on subsequent storage expansion enclosures until you complete the
chain.
Figure 76 on page 95 shows an acceptable EXP710, EXP810 and EXP100 intermix
configuration in a DS4700 Express environment. The cabling is acceptable because
it follows the cabling recommendations.
94
IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide
Summary of Contents for DS4700 EXPRESS
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